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Core body temperature and heart rate are direct, quantitative measures of heat strain. Skin rash (B) and urine color (C) are indirect. Sweat volume (D) is variable. CIHs apply monitoring protocols such as ACGIH Action Limits and ceiling criteria, using WBGT and physiological monitoring for high-risk tasks.

Mass spectrum patterns uniquely identify compounds. Retention time (A) aids but not definitive. FID (C) is GC only. Flow rate (D) influences separation but not identification. CIHs rely on GC/MS for confirmatory analysis of unknowns.

BSL-4 is the highest level, used for agents like Ebola and Marburg viruses. It requires positive pressure suits, dedicated facilities, and strict access controls. BSL-1 to BSL-3 involve progressively less stringent controls. CIHs must understand biosafety requirements to assess lab hazards.

The plenum equalizes airflow, converting velocity to static pressure for smooth fan intake. Hoods (A) capture contaminants, ducts (B) transport, fans (D) move air. CIHs check plenum design to ensure balanced flow.

At 95 dBA (5 dB above PEL), allowable time is 4 hours. At 100 dBA, allowable time is 2 hours. If a worker spends 2 hours at 100 dBA, that equals 100% of the daily dose. Under OSHA’s calculation, this is already a full dose. However, because only 2 hours were worked, the relative contribution can exceed 100% if combined with other exposures. Using NIOSH’s 3-dB exchange, the dose would be even higher. CIHs must understand both criteria when evaluating hearing conservation needs.